EP0374827A1 - Document-smoothing assembly - Google Patents

Document-smoothing assembly Download PDF

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Publication number
EP0374827A1
EP0374827A1 EP89123451A EP89123451A EP0374827A1 EP 0374827 A1 EP0374827 A1 EP 0374827A1 EP 89123451 A EP89123451 A EP 89123451A EP 89123451 A EP89123451 A EP 89123451A EP 0374827 A1 EP0374827 A1 EP 0374827A1
Authority
EP
European Patent Office
Prior art keywords
strip
roller
assembly according
bending blade
blade
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP89123451A
Other languages
German (de)
French (fr)
Inventor
Denis Riousset
Armand Orliaguet
Gilbert C/O Telic Alcatel Barbier
Robert C/O Telic Alcatel Pitie
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ALE International SAS
Original Assignee
Alcatel Business Systemes SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Alcatel Business Systemes SA filed Critical Alcatel Business Systemes SA
Publication of EP0374827A1 publication Critical patent/EP0374827A1/en
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H23/00—Registering, tensioning, smoothing or guiding webs
    • B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
    • B65H23/34—Apparatus for taking-out curl from webs

Definitions

  • the present invention relates to document processing devices, of the sheet reserve type in the form of a continuous strip in a roll. It relates more particularly to a set of leveling documents cut into sheets on such a roll tape.
  • a reserve of roll paper which is cut as and when required and which is cut to a desired length , in sheets.
  • the continuous reserve strips, in roll are provided with a standard width, 210 mm or 216 mm in general, and are of given length, 18 m, 50 m or 100 m for example.
  • the sheets cut from the strip are generally delivered stacked on top of each other, in order.
  • the conditioning of the roll paper causes that the cut sheets tend to roll up on themselves.
  • the phenomenon of winding, or "curl” is detrimental to the proper functioning of the processing devices using such packaging of the paper, and makes the subsequent manipulation of these sheets by the user not very easy.
  • the main problems posed by this phenomenon of natural winding of the sheets relate to the advance of the sheets and their stacking one on the other, avoiding possible jams.
  • the blade has a skew edge and is further mounted vertically movable in a guide, with the variation in diameter of the roller. It is carried by an articulated support having a terminal roller bearing on the periphery of the tape roll.
  • the blade is V-shaped and has against it a guide piece for guiding the strip.
  • This counter-piece has a concave face, V-shaped, on the inside of the strip, in which the blade bends the strip.
  • the object of the present invention is to avoid the above drawbacks by enabling quasi-flat sheets to be obtained.
  • It relates to a set of planing documents delivered in the form of sheets cut successively on a continuous strip in a roll, from which it is cut by drive means, comprising between said roller and said drive means, a bending blade having an end edge bearing against the outside face of the strip coming from the roller, and means for guiding the strip upstream of said bending blade, characterized in that said edge of the bending blade is substantially semi-circular and smooth with a radius of curvature less than 2 mm.
  • the edge of the bending blade has a radius of curvature less than 2 mm and preferably from 0.3 to 0.5 mm. It may also have over its length a convex profile bearing on the paper strip.
  • the bending blade or the guide means are mounted movable opposite the strip and the movable element is slaved to a detection of residual curvature of the strip or is made mobile with the variation in weight of the roller.
  • the bending blade is free to rotate transversely to the strip, for the free orientation of its edge against the strip, and the guide means are constituted by a simple guide pin, mounted fixed or adjustable positioning opposite the strip.
  • the strip roll is mounted to receive a constant or variable braking torque and then controlled by a detection of detected residual curvature.
  • the device illustrated ensures the printing of documents. It is a reserve of paper in the form of a continuous strip 1, in a roll 2.
  • it belongs to a fax machine.
  • the device comprises a print head 3, for example of thermal type, and a drive roller 4, which takes the strip 1 from the roller 2 and applies it against the head.
  • the drive roller is rotatable, according to arrow 4A. It is driven by a motor not shown, this motor is preferably a stepping motor.
  • a connector 5 receives the information to be printed on the tape from the outside.
  • a head control circuit 6 is coupled to the connector and to the head, for printing this information.
  • the printed strip Downstream of the drive roller 4 and the head 3, the printed strip is guided between deflectors 7A and 7B. It crosses a knife with fixed blade 8A and movable blade 8B.
  • the movable blade 8B is controlled opposite the cutting edge 8C of the fixed blade 8A, also called counter blade.
  • the arrow 8D illustrates the actuation of the movable blade 8B, for the progressive cutting of the strip, to the desired length.
  • This counter blade 8A can also have a slight oscillating movement to be in good contact with the movable blade.
  • a receptacle 9 receives the successive sheets 10 cut from the printed web. After printing and before being cut, the strip 1 also crosses non-static brushes, not shown. These brushes are preferably mounted just upstream of the deflectors 7A, 7B.
  • the head 3 is mounted on a head support frame 11, with its control circuit 6 and its connector 5. It is applied against the drive roller 4 mounted on a machine frame 12.
  • the head support frame 11 is centered opposite the drive roller 4, around the shaft or mandrel 14 of this roller. The paper strip is thus held between the head and the drive roller which takes it from the roller as and when successive lines of information are printed.
  • the paper roll 2 is kept free to rotate in a tray 13.
  • This tray is simply formed by a substantially square profile on the machine frame 12. It retains the paper roll 2 held by the front flank of the tray.
  • This roller has a standardized band width, for example 210 or 216 mm. It is of given length, for example 100, 50 or 18 m. Its diameter is variable depending on the length of tape stored and as and when the tape samples.
  • this processing device is equipped with a leveling assembly.
  • the leveling assembly comprises a blade called bending blade 20 and a guide pin 30, which are mounted between the paper roll 2 and the drive roller 4 and receive against them the continuous strip 1.
  • the bending blade 20 is mounted on the side of the outside face of the strip coming from the paper roll 2.
  • the guide pin 30 is between the bending blade 20 and the paper roll, but receives against it the inside face of the strip from the paper roll.
  • the bending blade 20 has an edge 21, flat and substantially semi-circular and with a smooth surface. It comes to bear on the paper strip, to give the strip 1 an angle between 60 and 160 °, against its edge 21. The preferred value of this angle is of the order of 120 °.
  • its edge 21 has a radius of curvature less than 2 mm. It is preferably between 0.2 and 0.6 mm. A radius of curvature of 0.3, 0.4 or 0.5 mm is optimal.
  • This bending blade is metallic, for example aluminum, its edge has a perfectly smooth surface.
  • the guide axis 30, upstream of the bending blade for the driven strip, ensures the almost constant maintenance of the angle made by the strip against the edge 21 of the bending blade 20, whatever the diameter of the paper roll 2.
  • This guide axis 30 is fixed, preferably being free to rotate on itself. It is mounted on the machine frame 12.
  • the bending blade 20 is mounted directly on the head support chassis 11, between two flanges 11A of this chassis.
  • the flanges 11A have, for mounting the bending blade, a T-shaped groove 11B open on the lower edge of each flange.
  • Each groove receives one of the ends of the edge of the bending blade, opposite the edge 21 and designated by the reference 22.
  • This edge 22 is, at least at its ends, T-shaped corresponding to each groove 11B.
  • the bending blade also has two opposite shoulders 23, parallel to the branches of its T-shaped edge 22, serving as stops under the lower edge of each flange 11A.
  • the ends of the bending blade 20 are fixed on the flanges, so that the blade is positioned precisely against the strip of paper and that its edge 21 gives the angle defined above to the paper pressing against it.
  • the leveling assembly forces the strip to bend in the opposite direction from its natural winding direction, which its packaging in rolls gives it, to counter and cancel this natural winding.
  • the effectiveness of the leveling assembly depends on the radius of curvature of the edge, the positioning of the bending blade which gives the aforementioned angle to the paper, and the tension of the paper, for a given type of paper.
  • This leveling assembly is particularly satisfactory in operation for paper rolls of relatively small length, such as those of 18 m.
  • the bending blade 20 is given a prestress. Its edge 21, seen along its length, has an arrow corresponding to the action of a force F transverse to the bending blade received in its middle or to an initial shape which has been given to it. Its lower edge 21A has a convex profile coming into pressure against the outer face of the paper strip 1. This convex profile prevents the strip from having against the edge 21 a greater angle in its middle than on its edges as well as a lower contact pressure in the middle than on its edges. The tension of the paper and this convex profile of the edge impose a comparable bending on the upstream guide axis 30, as illustrated; the guide axis 30 tends to have the same arrow as that of the edge 21.
  • the resulting leveling assembly is then made as effective in the middle of the paper strip only on its edges by a balanced distribution of the loads over the width of the strip. This is not strictly the case when the longitudinal profile of the bending blade is linear: the leveling assembly then ensured obtaining sheets with the edges slightly more unwound than the middle.
  • the strip coming from the leveling assembly has its middle part having a slight tendency to wind in the opposite direction to the initial natural winding direction, while the edges retain a slight tendency to wind in this initial natural direction.
  • the leveling assembly then gives resistance to the resulting sheets.
  • the bending blade 20 is resiliently mounted on its own support 25, independently of the print head 3 carried by the head support chassis 11.
  • a spring 26 ensures the maintenance of the bending blade 20 and gives it elasticity.
  • the bending blade 20 remains mounted with the print head 3 on the head support frame 11, as shown, or can be mounted on its independent support, without being given an elasticity, but it is the guide axis 30 which is resiliently mounted, by a spring 31, on the machine frame 12.
  • the leveling assembly according to the variants of FIGS. 3 and 4 is perfectly indicated when using large rolls of paper, such as those of 100 m of strip.
  • the step-by-step driving of the strip gives rise to variations in the speed of travel of the strip under the print head, which cause variations in the tension of the paper at the level of the leveling set, because of the inertia of the roller.
  • the elasticity given to the bending blade 20 or to the guide pin 30 then makes it possible, under these conditions, to reduce the acceleration of the strip at the level of the paper roll, therefore to reduce the influence of the inertia of the paper roll and therefore to minimize variations in web tension.
  • the bending blade 20 is mounted resiliently or not on its own support 25, but, moreover, is positioned in an adjustable manner opposite the outside face of the paper strip 1, by a motor 40.
  • the motor 40 drives the support 25 along associated slides, not shown, for raising and lowering the bending blade 20.
  • the control of the motor 40 is itself ensured by an electronic servo-control circuit 41.
  • This electronic servo circuit 41 is coupled to the drive roller 4 or to its control. It allows in particular to control the rise of the bending blade 20 when the device is in standby state, so that the blade does not mark the paper. It also makes it possible to control the descent of the blade against the paper, depending on the speed of this drive roller.
  • the leveling assembly with the descent of its blade controlled as a function of the speed of movement of the paper under the print head makes it possible to avoid variations in the tension of the paper at the level of the bending blade, caused by the inertia of the roll of paper.
  • the control of the motor 40 is, moreover, directly controlled by the diameter of the paper roll permanently detected.
  • a lever 42 freely resting on the periphery of the paper roll, and an angular sensor 43, associated with the lever, make it possible to detect at any time the diameter of the paper roll.
  • the sensor is coupled to the servo circuit 41 to adjust the positioning of the edge of the blade as a function of the measurement of this diameter.
  • the angle of the paper against the edge of the bending blade is made variable with the diameter of the paper roll.
  • the control of the motor 40 is furthermore controlled by the state of curvature of the successive sheets taken from the strip 1, which is detected.
  • the servo circuit 41 is coupled to sensors for measuring the distance between them and the strip, such as the three sensors 45, 46 and 47 shown. These sensors are mounted one after the other, downstream of the print head 3 and the drive roller 4, on the paper path, with a distance between the extreme sensors 45 and 47 remaining less the length of the leaves. Comparative detection of the individual measurements given by the sensors makes it possible to detect the radius of curvature of each sheet, in order to adjust accordingly the position of the bending blade 20 and therefore the angle which the strip makes against the edge of the blade of bending, to remove this detected radius of curvature.
  • This detection of the radius of curvature of the sheets indirectly takes into account the diameter of the paper roll which gave rise to it. In addition, it also takes into account the nature of the paper and its variations in behavior with the external conditions of humidity and temperature, in particular.
  • FIGS. 8 to 10 preferred embodiments of the treatment device have been illustrated, with compensation for variations in the initial curvature of the strip during its unwinding of the roll and / or correction of a residual curvature after leveling.
  • the processing device has an overall organization similar to that of FIG. 1.
  • the main elements have been illustrated there, adopting a more schematic representation and designating the identical or almost identical elements. identical to those of FIG. 1 by the same references.
  • the anti-static brushes designated under the reference 15, mounted upstream of the deflectors 7A and 7B and coming into contact with the strip 1, just after its printing.
  • the head support frame 11 has also been shown in dotted lines in an open position above the roller 4, according to arrow 7, by pivoting around a hinge axis 11C, to easy engagement by hand of the strip between the print head and the drive roller and in the deflectors 7A, 7B, during the loading of each new strip roll 2.
  • the bending blade remains identical with regard to its fundamental characteristic defined by its edge, but is mounted differently on the head support chassis 11, opposite the strip 1. It is therefore designated under the reference overall 20 ′, with its edge designated under the same reference 21 as above.
  • This bending blade 20 ′ is mounted free to rotate about an axis 50 carried by the head support frame 11.
  • This axis 50 is formed on a spacer support 11E at the end of the head support chassis 11. It crosses, in its middle, the upper part 26 of the blade 20 ′, opposite its edge 21.
  • This mounting method is simpler.
  • it above all makes the edge 21 free to rotate about this axis 50, as symbolized by the arrow 50A, by letting it orient itself, in response to a possible variation in tension that may present. between them the two longitudinal edges of the strip under its ends.
  • This degree of freedom of orientation of the edge makes it possible to at least partially compensate for a different strip tension along the edge.
  • the edge is oriented by itself and remains in a stable position with the same pressure exerted by its two ends on the two edges of the strip.
  • the roller 2 band no longer rests directly on the bottom of a tray retaining it as in Figure 1 but is mounted between two pressing members 52, such as two cones or two stepped cylinders, partially engaged in its mandrel 2A. These two cones 52 are biased towards each other to hold the roller 2 between them, while leaving it to rotate.
  • two pressing members 52 such as two cones or two stepped cylinders
  • the two cones are urged towards each other to exert a constant braking torque on the mandrel 2A of the roller 2. They are carried by two spring blades 53 mounted in the machine frame 12, which allow setting in easy place of the roller, by a simple spacing by hand of these blades.
  • two spring blades 53 mounted in the machine frame 12, which allow setting in easy place of the roller, by a simple spacing by hand of these blades.
  • only one of these spring blades is elastic and the other is rigid.
  • the constant braking torque generates a tensile force on the strip strand up to the edge 21 of the blade 20 ′ which is increasing, as the diameter of the roller decreases and therefore that the curvature of the rolled strip increases.
  • This increase in strip tension under the edge 21 with the decrease in the roll diameter allows at least partial compensation for the initial variation in curvature of the strip with the roll diameter, accentuating the correction carried out as the initial curvature increases.
  • the device can also comprise a detector 55 for the state of curvature of the sheets delivered.
  • This detector 55 is shown in dotted lines because it is optionally used, in the preferred embodiments described below, to control a correction of detected residual curvature.
  • the detector 55 is advantageously constituted by a photoelectric source of transmission / reception, with transmitting cell 55A and receiving cell 55B.
  • This source is mounted, below and at a short distance from the strip path, downstream of the knife 8A, 8B. It is slightly recessed in the upper face of a support 56 fixed, in the machine chassis, with its cells 55A and 55B arranged in the direction of advance of the strip.
  • the light emitted by the emitting cell is partially reflected by the strip.
  • the receiving cell sensitive to the level of reflected light captured delivers in correspondence a signal translating an absence of curvature or a possible residual curvature and its direction.
  • the short distance between the source and the strip path and a calibration of the measurement signal make it possible to detect the direction and the amplitude of the residual curvature, resulting from an insufficient or excessive effect of the bending blade.
  • An electronic circuit not shown, is of course coupled to this receiving cell, it interprets its output signal for the corresponding command of correction of curvature which it controls.
  • FIGS. 8 and 9 correspond to two preferred examples of implementation of the control of correction of curvature ensured from said detector.
  • FIG. 8 a first preferential mode of correction of residual band curvature detected by the detector 55 has simply been shown, which is ensured by acting on the band tension delivered from the roller 2.
  • the corresponding processing device conforms in all respects to that of FIG. 7, except for the assembly with controlled braking of the roller 2, leading to a variation in the tension of the strand located between the paper roller 2 and the drive roller or traction 4, and therefore of the tension of the paper under the edge 21 of the blade 20 ′.
  • the paper roll 2 is always mounted between two pressing cones or the like, partially engaged in the mandrel 2A of the roller, but one of the cones denoted 52A is fixed, while the other denoted 52B and said cone mobile is controlled in translation.
  • the fixed cone 52A is carried on a rigid support 60.
  • a wedge 61 can be associated with it to authorize the use of several widths of strip on a roll.
  • the movable cone 52B is in turn coupled to a stepping motor with control controlled by the signal delivered by the aforementioned detector 55 (FIG. 7).
  • This engine step by step is not as such shown, only its drive motor shaft is identified at 62.
  • This drive shaft 62 is coupled to a control arm 63 by two toothed pinions, or the like, 64, 65 in engagement l 'one on the other and which are mounted one on the shaft 62 and the other at one of the ends of the arm 63.
  • the arm 63 controls a connecting rod 66.
  • the connecting rod is itself articulated substantially in its middle on an axis 66B and at its other end 66C on an actuating rod 67 carrying the movable cone 52B.
  • the actuating rod 67 is guided in translation in bearings 68, as well as translated by the associated arrow 67A. These bearings provide immobilization in rotation of the movable cone 52B.
  • a pressure member 69 such as a spring system, is associated with the cone 52B and prevents any possible blocking in rotation of the paper roll, when it is placed between the cones 52A, 52B.
  • the stepper motor is a programmed command triggered by the operator, from a push button, for putting this movable cone in a retracted position for loading or unloading the roller and then in an initial position for retaining the roller. .
  • This programmed command is ensured by detection of a defined number of motor steps from the retracted position, to which corresponds a defined minimum braking torque exerted by the two cones on the roller 2 after its loading.
  • the rotation of the stepping motor is controlled in number of steps and in direction, from the detector 55.
  • This more or less significant pressure exerted on the mandrel of the roller makes it possible to obtain more or less intense braking of its rotation. It results in a corresponding variation in the tension of the paper under the edge of the bending blade and therefore in the effect of this edge, in order to obtain sheets that are detected to be almost plane.
  • FIG. 9 there is shown a second preferred mode of correction of residual band curvature, detected by the detector 55, which is produced by acting on the angle, noted a, made by the band coming from the roll 2 with the bending blade 20 ′, against its edge 21.
  • This device conforms in all points to that shown in FIG. 7, except for the mounting of the guide pin 30 made vertically movable to control this angle a.
  • the braking torque exerted on the roller 2 remains constant as in the embodiment according to FIG. 7. It consequently generates an increasing force on the paper strand, as the diameter of the roller decreases , which favors the correction of the initial curvature of the strip without optimizing it.
  • the correction of the residual curvature is carried out by slaving the position of the axis 30 and therefore of the angle a to this residual curvature detected by the detector 55.
  • the axis 30 is mounted between two identical supports 70 one apart on the other of the maximum bandwidth. These supports 70 are themselves carried by actuating rods 71, the rods are sliding in bearings 72 integral with the machine frame 12. These rods 72 are controlled in the bearings 72, from a stepping motor itself. even controlled from detector 55. This stepping motor is not as such shown, only its drive motor shaft is identified at 73.
  • the motor shaft 73 is coupled to a driven shaft 74 by a two pinions toothed 75, 76 or the like, engaged one on the other and mounted one on the shaft 73 and the other on the shaft 74.
  • This driven shaft is a shaft with two identical cams 77 for the one and the other of the two rods 72.
  • Two return springs 78 mounted on the upper part of each rod 72, between the axis 30 and the upper bearing 72, keep the rods 72 in contact with the cams 77.
  • the initial curvature of the paper strip increases.
  • This variation in curvature is compensated on the one hand by the increasing tension of the strand under the edge 21 of the bending blade 20 ′, due to the constant braking torque exerted by the pressure cones 52, and on the other hand by the variation controlled angle a, due to the servo in position of the axis 30 made from the detector 55 and the control stepper motor.
  • the residual curvature detected makes it possible to control the number of steps and the direction of rotation of this motor. It follows a corresponding rotation of the cams 77 and a vertical translation of the guide axis 30.
  • the angle a varies accordingly and adjusts the leveling effect of the edge 21 on the strip to obtain d '' a residual curvature detected almost zero.
  • the stepping motor is with programmed control to allow a maximum stroke of the axis 30 from an initial position in which it is represented, to a maximum possible position, in which the axis 30 is shown in dotted lines , by a rotation of the shaft 74 and therefore of the cams 77 on a half-turn.
  • FIG. 10 an alternative embodiment of the device is shown, with compensation for the variation in initial curvature of the strip produced by variation of tension of the strip under the edge 21 of the blade 20 ′ and by variation of the angle a made by the strip coming from the roller 2 with the blade 20 ′, against its edge 21.
  • This compensation is ensured in this case without subjecting the parameters concerned to a detection of residual curvature.
  • the overall organization of the elements of the device according to FIG. 10 is similar to that of the device according to FIG. 7, except for the mounting of the guide pin 30 and the paper roll 2 in the machine chassis 12.
  • the roller 2 remains held by the two preceding pressing members 52 such as cones mounted on the support blades 53, at least one of which is elastic. he is subjected to a constant braking torque exerted by the pressure cones.
  • the belt tension under the edge therefore increases as the diameter of the roll decreases.
  • the support blades 53 and supports 30A for the guide axis 30 are carried by a platform 80.
  • the platform 80 is articulated around an axis 81 secured to the machine frame 12, this axis d hinge 81 being more inside than the roller 2 and the guide pin 30, in the chassis 12. It is also resiliently supported by a spring 82 mounted under it, facing the roller 2 substantially, which urges it against the weight of the roller for its pivoting around the articulation axis 81, according to arrow 80A.
  • the thrust of the spring 82 is all the more effective as the weight of the roller decreases. It follows consequently a pivoting of the platform 80, from a substantially horizontal initial position, when the roller 2 is full, to a final biased position, which is defined by the limits of action of the spring and is illustrated in dotted lines, when the roller 2 is practically empty.
  • a pivoting of the platform 80 from a substantially horizontal initial position, when the roller 2 is full, to a final biased position, which is defined by the limits of action of the spring and is illustrated in dotted lines, when the roller 2 is practically empty.
  • To this initial position correspond initial positions of the roller on the pressure cones 52 and of the guide axis 30, for which the strip coming from the roller makes an initial angle defined with the blade 20 ′, against its edge 21.
  • the platform 80 also correspond to the final positions of the practically empty roller and of the guide axis, in which they are shown in dotted lines, which lead to a reduction in the value of the angle a made by the strip , then illustrated in dotted lines, with the blade 20 ′.
  • the spring 82 is a calibrated spring whose deformation as a function of the weight is defined with respect to the braking torque in order to obtain a desired variation of the angle a.
  • the bending blade has been considered to be mounted to rotate freely on its support axis so that its edge turns itself against the strip of paper.
  • the processing device with compensation for variations in the initial curvature of the strip or slaving to a detected residual curvature can be fitted with a bending blade mounted as in the device in FIG. 1.
  • the bending blade can also be free to rotate on a support independent of the print head chassis and this independent support can be made mobile, by a control mechanism similar to that shown in FIG. 9 for the axis of guide, the guide pin being made fixed when the blade is made mobile.

Abstract

It comprises a deflection blade (20) with a flat and substantially semi-circular edge (21), of radius of curvature less than 2 mm and preferably between 0.3 and 0.5 mm, bearing on the outer face of the web (1) coming from the reel (2), and an upstream guide shaft (30) associated with this blade. <IMAGE>

Description

La présente invention concerne les dispositifs de traitement de documents, du type à réserve de feuilles sous forme d'une bande continue en rouleau. Elle porte plus particulièrement sur un ensemble de planage de documents découpés en feuilles sur une telle bande en rouleau.The present invention relates to document processing devices, of the sheet reserve type in the form of a continuous strip in a roll. It relates more particularly to a set of leveling documents cut into sheets on such a roll tape.

Dans de nombreux dispositifs de traitement de documents, tels que télécopieur sou imprimantes notamment, il est courant de prévoir une réserve de papier en rouleau, que l'on débite au fur et à mesure des besoins et que l'on découpe à une longueur voulue, en feuilles. Les bandes continues de réserve, en rouleau, sont prévues de largeur normalisée, 210 mm ou 216mm en général, et sont de longueur donnée, 18 m, 50 m ou 100 m par exemple. Les feuilles découpées sur la bande sont en général délivrées empilées les unes sur les autres, dans l'ordre.In many document processing devices, such as facsimile or printers in particular, it is common to provide a reserve of roll paper, which is cut as and when required and which is cut to a desired length , in sheets. The continuous reserve strips, in roll, are provided with a standard width, 210 mm or 216 mm in general, and are of given length, 18 m, 50 m or 100 m for example. The sheets cut from the strip are generally delivered stacked on top of each other, in order.

Le conditionnement du papier en rouleau fait que les feuilles découpées ont tendance à s'enrouler sur elles-mêmes. Le phénomène d'enroulement, ou "curl" est nuisible au bon fonctionnement des dispositifs de traitement utilisant un tel conditionnement du papier, et rend peu aisée la manipulation ultérieure de ces feuilles par l'utilisateur. Dans les dispositifs, les problèmes principaux que pose ce phénomène d'enroulement naturel des feuilles sont relatifs à l'avance des feuilles et à leur empilage les unes sur les autres, en évitant d'éventuels bourrages.The conditioning of the roll paper causes that the cut sheets tend to roll up on themselves. The phenomenon of winding, or "curl" is detrimental to the proper functioning of the processing devices using such packaging of the paper, and makes the subsequent manipulation of these sheets by the user not very easy. In the devices, the main problems posed by this phenomenon of natural winding of the sheets relate to the advance of the sheets and their stacking one on the other, avoiding possible jams.

On connaît par les documents JP - A - 58 188254 - Patent Abstracts of Japan vol. 8 n° 32 du 10 février 1984 - et JP 58 152753 - Patent Abstracts of Japan vol.7 n° 275 du 8 décembre 1983 - des ensembles de planage comportant une plaque de correction ou lame de cintrage à arête vive en appui sur la face extérieure de la bande déroulée du rouleau. De part et d'autre de la lame, la bande est maintenue tendue par une paire d'éléments de tension amont et une paire d'éléments d'entraînement aval.We know from documents JP - A - 58 188254 - Patent Abstracts of Japan vol. 8 No. 32 of February 10, 1984 - and JP 58 152753 - Patent Abstracts of Japan vol. 7 No. 275 of December 8, 1983 - leveling assemblies comprising a correction plate or bending blade with a sharp edge resting on the face outside of the unrolled strip of the roll. On either side of the blade, the strip is held taut by a pair of upstream tensioning elements and a pair of downstream driving elements.

Selon le premier de ces documents, la lame est à arête biaise et est en outre montée mobile verticalement dans un guide, avec la variation de diamètre du rouleau. Elle est portée par un support articulé ayant un galet terminal en appui sur la périphérie du rouleau de bande.According to the first of these documents, the blade has a skew edge and is further mounted vertically movable in a guide, with the variation in diameter of the roller. It is carried by an articulated support having a terminal roller bearing on the periphery of the tape roll.

Selon le deuxième de ces documents, la lame est arête en V et a en regard d'elle une contre-pièce de guidage de la bande. Cette contre-pièce est à face concave, en forme de V, sur la face intérieure de la bande, dans laquelle la lame vient plier la bande.According to the second of these documents, the blade is V-shaped and has against it a guide piece for guiding the strip. This counter-piece has a concave face, V-shaped, on the inside of the strip, in which the blade bends the strip.

Dans ces ensembles, la tension de la bande sous l'arête et la pression de l'arête sur la bande doivent rester relativement faibles pour éviter une rupture des fibres de la bande, mais suffisantes pour l'obtention d'un effet de déroulement. Les valeurs de ces paramètres sont difficiles à optimiser. Ces systèmes ne permettent pas l'obtention d'un planage entièrement satisfaisant.In these assemblies, the tension of the strip under the edge and the pressure of the edge on the strip must remain relatively low to avoid breaking the fibers of the strip, but sufficient for obtaining an unwinding effect. The values of these parameters are difficult to optimize. These systems do not allow a completely satisfactory leveling to be obtained.

La présente invention a pour but d'éviter les inconvénients précédents en permettant l'obtention de feuilles quasi-planes.The object of the present invention is to avoid the above drawbacks by enabling quasi-flat sheets to be obtained.

Elle a pour objet un ensemble de planage de documents délivrés sous forme de feuilles découpées successivement sur une bande continue en rouleau, duquel elle est débitée par des moyens d'entraînement, comportant entre ledit rouleau et lesdits moyens d'entraînement, une lame de cintrage présentant une arête terminale en appui contre la face extérieure de la bande issue de rouleau, et des moyens de guidage de la bande en amont de ladite lame de cintrage, caractérisé en ce que ladite arête de la lame de cintrage est sensiblement semi-circulaire et lisse avec un rayon de courbure inférieur à 2 mm.It relates to a set of planing documents delivered in the form of sheets cut successively on a continuous strip in a roll, from which it is cut by drive means, comprising between said roller and said drive means, a bending blade having an end edge bearing against the outside face of the strip coming from the roller, and means for guiding the strip upstream of said bending blade, characterized in that said edge of the bending blade is substantially semi-circular and smooth with a radius of curvature less than 2 mm.

Selon une autre caractéristique, l'arête de la lame de cintrage a un rayon de courbure inférieur à 2 mm et de préférence de 0,3 à 0,5 mm. Elle peut présenter en outre sur sa longueur un profil convexe venant en appui sur la bande de papier.According to another characteristic, the edge of the bending blade has a radius of curvature less than 2 mm and preferably from 0.3 to 0.5 mm. It may also have over its length a convex profile bearing on the paper strip.

Selon une autre caractéristique, la lame de cintrage ou les moyens de guidage sont montés mobiles en regard de la bande et l'élément mobile est asservi à une détection de courbure résiduelle de bande ou est rendu mobile avec la variation de poids du rouleau.According to another characteristic, the bending blade or the guide means are mounted movable opposite the strip and the movable element is slaved to a detection of residual curvature of the strip or is made mobile with the variation in weight of the roller.

Selon une autre caractéristique, la lame de cintrage est libre en rotation transversalement à la bande, pour la libre orien­tation de son arête contre la bande, et les moyens de guidage sont constitués par un simple axe de guidage, monté fixe ou de positionnement réglable en regard de la bande.According to another characteristic, the bending blade is free to rotate transversely to the strip, for the free orientation of its edge against the strip, and the guide means are constituted by a simple guide pin, mounted fixed or adjustable positioning opposite the strip.

Selon une autre caractéristique, le rouleau de bande est monté pour recevoir un couple de freinage constant ou variable et alors contrôlé par une détection de courbure résiduelle détectée.According to another characteristic, the strip roll is mounted to receive a constant or variable braking torque and then controlled by a detection of detected residual curvature.

Les caractéristiques et avantages de la présente invention apparaîtront plus clairement au cours de la description donnée ci-après en regard des dessins ci-annexés. Dans ces dessins :

  • - La figure 1 représente schématiquement un dispositif de traitement de documents, à réserve de papier en rouleau, qui est équipé d'un ensemble de planage selon la présente invention,
  • - La figure 2 illustre schématiquement le profil des éléments de l'ensemble de planage de la figure 1,
  • - Les figures 3 et 4 représentent schématiquement deux variantes de réalisation de l'ensemble de planage de la figure 1,
  • - Les figures 5 et 6 représentent deux autres variantes de réalisation de l'ensemble de planage de la figure 3, avec une commande d'asservissement pour l'un de ses éléments,
  • - La figure 7 représente schématiquement une variante de réalisation du dispositif de traitement de documents, selon la présente invention,
  • - La figure 8 représente en regard de la figure 7 une adaptation supplémentaire de ce dispositif, pour un premier mode préférentiel de correction d'une courbure résiduelle de bande détectée,
  • - La figure 9 représente schématiquement le dispositif selon la figure 7 avec un second mode de correction de courbure résiduelle de bande détectée,
  • - La figure 10 représente schématiquement le dispositif selon la figure 7 avec une compensation supplémentaire d'une variation de courbure initiale de bande.
The characteristics and advantages of the present invention will appear more clearly during the description given below with reference to the attached drawings. In these drawings:
  • FIG. 1 schematically represents a document processing device, with roll paper reserve, which is equipped with a leveling assembly according to the present invention,
  • FIG. 2 schematically illustrates the profile of the elements of the leveling assembly of FIG. 1,
  • FIGS. 3 and 4 schematically represent two alternative embodiments of the leveling assembly of FIG. 1,
  • FIGS. 5 and 6 represent two other alternative embodiments of the leveling assembly of FIG. 3, with a servo control for one of its elements,
  • FIG. 7 schematically represents an alternative embodiment of the document processing device according to the present invention,
  • FIG. 8 represents, with reference to FIG. 7, an additional adaptation of this device, for a first preferential mode of correction of a residual curvature of the tape detected,
  • FIG. 9 schematically represents the device according to FIG. 7 with a second mode of correction of the residual curvature of the band detected,
  • - Figure 10 shows schematically the device according to Figure 7 with additional compensation for a variation of initial curvature of the strip.

Dans la figure 1, le dispositif illustré assure l'impression de documents. Il est à réserve de papier sous forme d'une bande continue 1, en rouleau 2.In FIG. 1, the device illustrated ensures the printing of documents. It is a reserve of paper in the form of a continuous strip 1, in a roll 2.

Il appartient par exemple à un télécopieur.For example, it belongs to a fax machine.

Le dispositif comporte une tête d'impression 3, par exemple de type thermique, et un rouleau d'entraînement 4, qui prélève la bande 1 du rouleau 2 et l'applique contre la tête. Le rouleau d'entraînement est rotatif, selon la flèche 4A. Il est entraîné par un moteur non représenté, ce moteur est de préférence un moteur pas à pas. Un connecteur 5 reçoit de l'extérieur les informations à imprimer sur la bande. Un circuit 6 de commande de la tête est couplé au connecteur et à la tête, pour l'impression de ces informa­tions.The device comprises a print head 3, for example of thermal type, and a drive roller 4, which takes the strip 1 from the roller 2 and applies it against the head. The drive roller is rotatable, according to arrow 4A. It is driven by a motor not shown, this motor is preferably a stepping motor. A connector 5 receives the information to be printed on the tape from the outside. A head control circuit 6 is coupled to the connector and to the head, for printing this information.

En aval du rouleau d'entraînement 4 et de la tête 3, la bande imprimée est guidée entre des déflecteurs 7A et 7B. Elle traverse un couteau à lame fixe 8A et lame mobile 8B. La lame mobile 8B est commandée en regard de l'arête de coupe 8C de la lame fixe 8A, dite également contre-lame. La flèche 8D illustre l'actionnement de la lame mobile 8B, pour la coupe progressive de la bande, à la longueur voulue. Cette contre lame 8A peut également avoir un léger mouvement oscillant pour être en bon contact avec la lame mobile. Un réceptacle 9 reçoit les feuilles successives 10 découpées sur la bande imprimée. Après impression et avant sa coupe, la bande 1 traverse en outre des balais anti-statiques non représentés. Ces balais sont de préférence montés juste en amont des déflecteurs 7A, 7B.Downstream of the drive roller 4 and the head 3, the printed strip is guided between deflectors 7A and 7B. It crosses a knife with fixed blade 8A and movable blade 8B. The movable blade 8B is controlled opposite the cutting edge 8C of the fixed blade 8A, also called counter blade. The arrow 8D illustrates the actuation of the movable blade 8B, for the progressive cutting of the strip, to the desired length. This counter blade 8A can also have a slight oscillating movement to be in good contact with the movable blade. A receptacle 9 receives the successive sheets 10 cut from the printed web. After printing and before being cut, the strip 1 also crosses non-static brushes, not shown. These brushes are preferably mounted just upstream of the deflectors 7A, 7B.

La tête 3 est montée sur un châssis support de tête 11, avec son circuit de commande 6 et son connecteur 5. Elle vient s'appliquer contre le rouleau d'entraînement 4 monté sur un châssis de machine 12. Le châssis support de tête 11 vient se centrer en regard du rouleau d'entraînement 4, autour de l'arbre ou mandrin 14 de ce rouleau. La bande de papier est ainsi maintenue entre la tête et le rouleau d'entraînement qui la prélève du rouleau au fur et à mesure de l'impression de lignes successives d'informations.The head 3 is mounted on a head support frame 11, with its control circuit 6 and its connector 5. It is applied against the drive roller 4 mounted on a machine frame 12. The head support frame 11 is centered opposite the drive roller 4, around the shaft or mandrel 14 of this roller. The paper strip is thus held between the head and the drive roller which takes it from the roller as and when successive lines of information are printed.

Le rouleau de papier 2 est maintenu libre en rotation dans un bac 13. Ce bac est simplement formé par un profil sensiblement en équerre, sur le châssis de machine 12. Il retient le rouleau de papier 2 maintenu par le flanc avant du bac. Ce rouleau est de largeur de bande normalisée, par exemple de 210 ou 216 mm. Il est de longueur donnée, par exemple de 100, 50 ou 18 m. Son diamètre est variable selon la longueur de bande stockée et au fur et à mesure des prélèvements de bande.The paper roll 2 is kept free to rotate in a tray 13. This tray is simply formed by a substantially square profile on the machine frame 12. It retains the paper roll 2 held by the front flank of the tray. This roller has a standardized band width, for example 210 or 216 mm. It is of given length, for example 100, 50 or 18 m. Its diameter is variable depending on the length of tape stored and as and when the tape samples.

Il peut ainsi varier de 100 à 35 mm environ.It can thus vary from 100 to 35 mm approximately.

Pour que les feuilles imprimées 10 stockées successivement dans le réceptable 9 soient correctement délivrées en venant s'empiler les unes sur les autres, ce dispositif de traitement est équipé d'un ensemble de planage.So that the printed sheets 10 stored successively in the receptacle 9 are correctly delivered by stacking one on the other, this processing device is equipped with a leveling assembly.

L'ensemble de planage selon la présente invention comporte une lame dite lame de cintrage 20 et un axe de guidage 30, qui sont montés entre le rouleau de papier 2 et le rouleau d'entraînement 4 et reçoivent contre eux la bande continue 1.The leveling assembly according to the present invention comprises a blade called bending blade 20 and a guide pin 30, which are mounted between the paper roll 2 and the drive roller 4 and receive against them the continuous strip 1.

La lame de cintrage 20 est montée du côté de la face extérieure de la bande issue du rouleau de papier 2. L'axe de guidage 30 est entre la lame de cintrage 20 et le rouleau de papier, mais reçoit contre lui la face intérieure de la bande issue du rouleau de papier. La lame de cintrage 20 a une arête 21, plate et sensiblement semi-­circulaire et d'état de surface lisse. Elle vient en appui sur la bande de papier, pour donner à la bande 1 un angle compris entre 60 et 160°, contre son arête 21. La valeur préférentielle de cet angle est de l'ordre de 120°.The bending blade 20 is mounted on the side of the outside face of the strip coming from the paper roll 2. The guide pin 30 is between the bending blade 20 and the paper roll, but receives against it the inside face of the strip from the paper roll. The bending blade 20 has an edge 21, flat and substantially semi-circular and with a smooth surface. It comes to bear on the paper strip, to give the strip 1 an angle between 60 and 160 °, against its edge 21. The preferred value of this angle is of the order of 120 °.

A cet effet, son arête 21 est de rayon de courbure inférieur à 2 mm. Il est de préférence compris entre 0,2 et 0,6 mm. Un rayon de courbure de 0,3, 0,4 ou 0,5 mm est optimal. Cette lame de cintrage est métallique, par exemple en aluminium, son arête est de surface parfaitement lisse.To this end, its edge 21 has a radius of curvature less than 2 mm. It is preferably between 0.2 and 0.6 mm. A radius of curvature of 0.3, 0.4 or 0.5 mm is optimal. This bending blade is metallic, for example aluminum, its edge has a perfectly smooth surface.

L'axe de guidage 30, en amont de la lame de cintrage pour la bande entraînée, assure le maintien quasi-constant de l'angle que fait la bande contre l'arête 21 de la lame de cintrage 20, quel que soit le diamètre du rouleau de papier 2. Cet axe de guidage 30 est fixe, en étant de préférence libre en rotation sur lui-même. Il est monté sur le châssis de machine 12.The guide axis 30, upstream of the bending blade for the driven strip, ensures the almost constant maintenance of the angle made by the strip against the edge 21 of the bending blade 20, whatever the diameter of the paper roll 2. This guide axis 30 is fixed, preferably being free to rotate on itself. It is mounted on the machine frame 12.

Dans la figure 1, la lame de cintrage 20 est montée directement sur le châssis support de tête 11, entre deux flasques 11A de ce châssis. Les flasques 11A ont, pour le montage de la lame de cintrage, une rainure en T 11B ouverte sur le bord inférieur de chaque flasque. Chaque rainure reçoit l'une des extrémités du bord de la lame de cintrage, opposé à l'arête 21 et désigné par la référence 22. Ce bord 22 est, tout au moins à ses extrémités, profilé en T correspondant à chaque rainure 11B. La lame de cintrage a en outre deux épaulements opposés 23, parallèles aux branches de son bord en T 22, servant de butées sous le bord inférieur de chaque flasque 11A. Les extrémités de la lame de cintrage 20 sont fixées sur les flasques, pour que la lame soit positionnée de manière précise contre la bande de papier et que son arête 21 donne l'angle défini précédemment au papier en appui contre elle.In FIG. 1, the bending blade 20 is mounted directly on the head support chassis 11, between two flanges 11A of this chassis. The flanges 11A have, for mounting the bending blade, a T-shaped groove 11B open on the lower edge of each flange. Each groove receives one of the ends of the edge of the bending blade, opposite the edge 21 and designated by the reference 22. This edge 22 is, at least at its ends, T-shaped corresponding to each groove 11B. The bending blade also has two opposite shoulders 23, parallel to the branches of its T-shaped edge 22, serving as stops under the lower edge of each flange 11A. The ends of the bending blade 20 are fixed on the flanges, so that the blade is positioned precisely against the strip of paper and that its edge 21 gives the angle defined above to the paper pressing against it.

L'ensemble de planage force la bande à se plier dans le sens contraire de son sens d'enroulement naturel, que lui donne son conditionnement en rouleau, pour contrer et annuler cet enroulement naturel.The leveling assembly forces the strip to bend in the opposite direction from its natural winding direction, which its packaging in rolls gives it, to counter and cancel this natural winding.

L'efficacité de l'ensemble de planage dépend du rayon de courbure de l'arête, du positionnement de la lame de cintrage qui donne l'angle précité au papier, et de la tension du papier, pour une nature de papier donnée.The effectiveness of the leveling assembly depends on the radius of curvature of the edge, the positioning of the bending blade which gives the aforementioned angle to the paper, and the tension of the paper, for a given type of paper.

Cet ensemble de planage est de fonctionnement particulièrement satisfaisant pour des rouleaux de papier de longueur relativement petite, tels que ceux de 18 m.This leveling assembly is particularly satisfactory in operation for paper rolls of relatively small length, such as those of 18 m.

En outre, de préférence, ainsi qu'illustré dans la figure 2, on donne à la lame de cintrage 20 une précontrainte. Son arête 21, vue selon sa longueur, présente une flèche correspondant à l'action d'une force F transversale à la lame de cintrage reçue en son milieu ou à une forme initiale qui lui a été donnée. Son bord inférieur 21A a un profil convexe venant en pression contre la face extérieure de la bande de papier 1. Ce profil convexe s'oppose à ce que la bande ait contre l'arête 21 un angle plus grand en son milieu que sur ses bords ainsi qu'une pression de contact plus faible en son milieu que sur ses bords. La tension du papier et ce profil convexe de l'arête imposent une flexion comparable sur l'axe de guidage amont 30, ainsi qu'illustré ; l'axe de guidage 30 a tendance a présenter la même flèche que celle de l'arête 21.Furthermore, preferably, as illustrated in FIG. 2, the bending blade 20 is given a prestress. Its edge 21, seen along its length, has an arrow corresponding to the action of a force F transverse to the bending blade received in its middle or to an initial shape which has been given to it. Its lower edge 21A has a convex profile coming into pressure against the outer face of the paper strip 1. This convex profile prevents the strip from having against the edge 21 a greater angle in its middle than on its edges as well as a lower contact pressure in the middle than on its edges. The tension of the paper and this convex profile of the edge impose a comparable bending on the upstream guide axis 30, as illustrated; the guide axis 30 tends to have the same arrow as that of the edge 21.

L'ensemble de planage résultant est alors rendu aussi efficace au milieu de la bande de papier que sur ses bords par une répartition équilibrée des charges sur la largeur de la bande. Ceci n'est pas rigoureusement le cas lorsque le profil longitudinal de la lame de cintrage est linéaire : l'ensemble de planage assurait alors l'obtention de feuilles avec les bords légèrement plus déroulés que le milieu.The resulting leveling assembly is then made as effective in the middle of the paper strip only on its edges by a balanced distribution of the loads over the width of the strip. This is not strictly the case when the longitudinal profile of the bending blade is linear: the leveling assembly then ensured obtaining sheets with the edges slightly more unwound than the middle.

En outre, on peut même ainsi accentuer l'effet de déroulement de la bande en son milieu par rapport à ses bords. La bande issue de l'ensemble de planage a sa partie médiane présentant une légère tendance à s'enrouler en sens inverse du sens d'enroulement naturel initial, tandis que les bords conservent une légère tendance à s'enrouler dans ce sens naturel initial. L'ensemble de planage donne alors une tenue aux feuilles résultantes.In addition, it is thus even possible to accentuate the unwinding effect of the strip in the middle relative to its edges. The strip coming from the leveling assembly has its middle part having a slight tendency to wind in the opposite direction to the initial natural winding direction, while the edges retain a slight tendency to wind in this initial natural direction. The leveling assembly then gives resistance to the resulting sheets.

Dans les figures 3 et 4 on a illustré schématiquement deux variantes de réalisation par rapport à la figure 1. Dans ces figures 3 et 4 et dans les suivantes, les références précédentes sont utilisées pour désigner les mêmes éléments.In Figures 3 and 4 schematically illustrated two alternative embodiments with respect to Figure 1. In these Figures 3 and 4 and in the following, the preceding references are used to designate the same elements.

Dans la figure 3, la lame de cintrage 20 est montée de manière élastique sur son propre support 25, indépendamment de la tête d'impression 3 portée par le châssis support de tête 11. Un ressort 26 assure le maintien de la lame de cintrage 20 et lui donne une élasticité.In FIG. 3, the bending blade 20 is resiliently mounted on its own support 25, independently of the print head 3 carried by the head support chassis 11. A spring 26 ensures the maintenance of the bending blade 20 and gives it elasticity.

Par contre dans la variante selon la figure 4, la lame de cintrage 20 reste montée avec la tête d'impression 3 sur le châssis support de tête 11, comme représenté, ou peut être montée sur son support indépendant, sans qu'on lui donne une élasticité, mais c'est l'axe de guidage 30 qui est monté élastiquement, par un res­sort 31, sur le châssis de machine 12.By cons in the variant according to Figure 4, the bending blade 20 remains mounted with the print head 3 on the head support frame 11, as shown, or can be mounted on its independent support, without being given an elasticity, but it is the guide axis 30 which is resiliently mounted, by a spring 31, on the machine frame 12.

L'ensemble de planage selon les variantes des figures 3 et 4 est tout à fait indiqué lors de l'utilisation de gros rouleaux de papier, tels que ceux de 100 m de bande.The leveling assembly according to the variants of FIGS. 3 and 4 is perfectly indicated when using large rolls of paper, such as those of 100 m of strip.

En effet, avec de tels rouleaux, l'entraînement pas à pas de la bande, donne lieu à des variations de vitesse de défilement de la bande sous la tête d'impression, qui entrainent des variations de tension du papier au niveau de l'ensemble de planage, à cause de l'inertie du rouleau. L'élasticité donnée à la lame de cintrage 20 ou à l'axe de guidage 30 permet alors, pour ces conditions, de diminuer l'accélération de la bande au niveau du rouleau de papier, donc de diminuer l'influence de l'inertie du rouleau de papier et donc de minimiser les variations de tension de la bande.Indeed, with such rollers, the step-by-step driving of the strip gives rise to variations in the speed of travel of the strip under the print head, which cause variations in the tension of the paper at the level of the leveling set, because of the inertia of the roller. The elasticity given to the bending blade 20 or to the guide pin 30 then makes it possible, under these conditions, to reduce the acceleration of the strip at the level of the paper roll, therefore to reduce the influence of the inertia of the paper roll and therefore to minimize variations in web tension.

Dans les variantes selon les figures 5 et 6, la lame de cintra­ge 20 est montée élastiquement ou non sur son propre support 25, mais, en outre, est positionnée de manière réglable en regard de la face extérieure de la bande de papier 1, par un moteur 40.In the variants according to FIGS. 5 and 6, the bending blade 20 is mounted resiliently or not on its own support 25, but, moreover, is positioned in an adjustable manner opposite the outside face of the paper strip 1, by a motor 40.

Le moteur 40 entraîne le support 25 le long de glissières associées, non représentées, pour la montée et la descente de la lame de cintrage 20. La commande du moteur 40 est elle-même assurée par un circuit électronique d'asservissement 41.The motor 40 drives the support 25 along associated slides, not shown, for raising and lowering the bending blade 20. The control of the motor 40 is itself ensured by an electronic servo-control circuit 41.

Ce circuit électronique d'asservissement 41 est couplé au rouleau d'entraînement 4 ou à sa commande. Il permet en particulier de commander la remontée de la lame de cintrage 20 lorsque le disposi­tif est en état de veille, de façon que la lame ne marque pas le papier. Il permet, en outre, de contrôler la descente de la lame contre le papier, en fonction de la vitesse de ce rouleau d'entraîne­ment.This electronic servo circuit 41 is coupled to the drive roller 4 or to its control. It allows in particular to control the rise of the bending blade 20 when the device is in standby state, so that the blade does not mark the paper. It also makes it possible to control the descent of the blade against the paper, depending on the speed of this drive roller.

L'ensemble de planage à descente de sa lame contrôlée en fonction de la vitesse de défilement du papier sous la tête d'impres­sion permet d'éviter des variations de tension du papier au niveau de la lame de cintrage, causées par l'inertie du rouleau de papier.The leveling assembly with the descent of its blade controlled as a function of the speed of movement of the paper under the print head makes it possible to avoid variations in the tension of the paper at the level of the bending blade, caused by the inertia of the roll of paper.

Dans la variante selon la figure 5, la commande du moteur 40 est, en outre, asservie directement au diamètre du rouleau de papier détecté en permanence. Un levier 42, venant librement en appui sur la périphérie du rouleau de papier, et un capteur angulaire 43, associé au levier, permettent de détecter à chaque instant le diamètre du rouleau de papier. La capteur est couplé au circuit d'asservisse­ment 41 pour ajuster le positionnement de l'arête de la lame en fonction de la mesure de ce diamètre. Ainsi l'angle du papier contre l'arête de la lame de cintrage est rendu variable avec le diamètre du rouleau de papier.In the variant according to FIG. 5, the control of the motor 40 is, moreover, directly controlled by the diameter of the paper roll permanently detected. A lever 42, freely resting on the periphery of the paper roll, and an angular sensor 43, associated with the lever, make it possible to detect at any time the diameter of the paper roll. The sensor is coupled to the servo circuit 41 to adjust the positioning of the edge of the blade as a function of the measurement of this diameter. Thus the angle of the paper against the edge of the bending blade is made variable with the diameter of the paper roll.

Dans la variante selon la figure 6, la commande du moteur 40 est par contre, en outre, asservie à l'état de courbure des feuilles successives prélevées sur la bande 1, qui est détecté. Le circuit d'asservissement 41 est couplé à des capteurs de mesure de distance entre eux et la bande, tels que les trois capteurs 45, 46 et 47 représentés. Ces capteurs sont montés l'un à la suite de l'autre, en aval de la tête d'impression 3 et du galet d'entraînement 4, sur le chemin de papier, avec une distance entre les capteurs extrêmes 45 et 47 restant inférieure à la longueur des feuilles. Une détection comparée des mesures individuelles données par les capteurs permet de détecter le rayon de courbure de chaque feuille, pour régler en conséquence la position de la lame de cintrage 20 et donc l'angle que fait la bande contre l'arête de la lame de cintrage, pour supprimer ce rayon de courbure détecté.In the variant according to FIG. 6, the control of the motor 40 on the other hand, is furthermore controlled by the state of curvature of the successive sheets taken from the strip 1, which is detected. The servo circuit 41 is coupled to sensors for measuring the distance between them and the strip, such as the three sensors 45, 46 and 47 shown. These sensors are mounted one after the other, downstream of the print head 3 and the drive roller 4, on the paper path, with a distance between the extreme sensors 45 and 47 remaining less the length of the leaves. Comparative detection of the individual measurements given by the sensors makes it possible to detect the radius of curvature of each sheet, in order to adjust accordingly the position of the bending blade 20 and therefore the angle which the strip makes against the edge of the blade of bending, to remove this detected radius of curvature.

Cette détection du rayon de courbure des feuilles tient compte de manière indirecte du diamètre du rouleau de papier qui lui a donné naissance. En outre, elle prend en compte aussi la nature du papier et ses variations de comportement avec les conditions extérieures d'humidité et de température, notamment.This detection of the radius of curvature of the sheets indirectly takes into account the diameter of the paper roll which gave rise to it. In addition, it also takes into account the nature of the paper and its variations in behavior with the external conditions of humidity and temperature, in particular.

Le décalage entre le mesure de rayon de courbure que présente la feuille imprimée et la correction résultante appliquée à la feuille suivante est d'effet pratiquement négligeable.The difference between the measurement of the radius of curvature presented by the printed sheet and the resulting correction applied to the next sheet has practically negligible effect.

En variante, par rapport aux figures 5 et 6, c'est l'axe de guidage 30 qui est positionné de manière réglable en regard de la bande 1 par le moteur précité par une commande asservie telle que délivrée par le circuit 41.As a variant, with respect to FIGS. 5 and 6, it is the guide axis 30 which is positioned in an adjustable manner opposite the strip 1 by the aforementioned motor by a servo control as delivered by the circuit 41.

Dans les figures 8 à 10 on a illustré des réalisations préféren­tielles du dispositif de traitement, avec une compensation des variations de courbure initiale de bande au cours de son déroulement du rouleau et/ou une correction d'une courbure résiduelle après planage.In FIGS. 8 to 10, preferred embodiments of the treatment device have been illustrated, with compensation for variations in the initial curvature of the strip during its unwinding of the roll and / or correction of a residual curvature after leveling.

Dans la variante de réalisation selon la figure 7, le dispositif de traitement est d'organisation d'ensemble analogue à celle de la figure 1. On y a illustré les éléments principaux, en adoptant une représentation plus schématique et désignant les éléments identiques ou quasi identiques à ceux de la figure 1 par les mêmes références. On y a également représenté les balais anti-statiques, désignés sous la référence 15, montés en amont des déflecteurs 7A et 7B et venant en contact avec la bande 1, juste après son impression. Dans cette figure 7, on a en outre représenté en pointillés le châssis support de tête 11 mis dans une position d'ouverture au-­dessus du rouleau 4, selon la flèche 7, par pivotement autour d'un axe d'articulation 11C, pour l'engagement aisé à la main de la bande entre la tête d'impression et le rouleau d'entraînement et dans les déflecteurs 7A, 7B, lors du chargement de chaque nouveau rouleau 2 de bande.In the variant embodiment according to FIG. 7, the processing device has an overall organization similar to that of FIG. 1. The main elements have been illustrated there, adopting a more schematic representation and designating the identical or almost identical elements. identical to those of FIG. 1 by the same references. Also shown are the anti-static brushes, designated under the reference 15, mounted upstream of the deflectors 7A and 7B and coming into contact with the strip 1, just after its printing. In this FIG. 7, the head support frame 11 has also been shown in dotted lines in an open position above the roller 4, according to arrow 7, by pivoting around a hinge axis 11C, to easy engagement by hand of the strip between the print head and the drive roller and in the deflectors 7A, 7B, during the loading of each new strip roll 2.

Les différences de cette variante selon la figure 7 par rapport à la figure 1 sont seules précisées ci-après.The differences of this variant according to FIG. 7 compared to FIG. 1 are only specified below.

Dans cette figure 7, la lame de cintrage reste identique en ce qui concerne sa caractérisitique fondamentale définie par son arête, mais est montée différemment sur le châssis support de tête 11, en regard de la bande 1. Elle est en conséquence désignée sous la référence globale 20′, avec son arête désignée sous la même référence 21 que précédemment.In this FIG. 7, the bending blade remains identical with regard to its fundamental characteristic defined by its edge, but is mounted differently on the head support chassis 11, opposite the strip 1. It is therefore designated under the reference overall 20 ′, with its edge designated under the same reference 21 as above.

Cette lame de cintrage 20′ est montée libre en rotation autour d'un axe 50 porté par le châssis support de tête 11.This bending blade 20 ′ is mounted free to rotate about an axis 50 carried by the head support frame 11.

Cet axe 50 est formé sur un support entretoise 11E en bout du châssis support de tête 11. Il traverse, en son milieu, la partie supérieure 26 de la lame 20′, opposée à son arête 21.This axis 50 is formed on a spacer support 11E at the end of the head support chassis 11. It crosses, in its middle, the upper part 26 of the blade 20 ′, opposite its edge 21.

Ce mode de montage est plus simple. En outre, il rend surtout l'arête 21 libre en rotation autour de cet axe 50, ainsi que symbolisé par la flèche 50A, en la laissant s'orienter d'elle-même, en réponse à une possible variation de tension que peuvent présenter entre eux les deux bords longitudinaux de la bande sous ses extrémités. Ce degré de liberté d'orientation de l'arête permet de compenser au moins partiellement une tension de bande différente le long de l'arête. L'arête s'oriente d'elle même et reste en position stable avec la même pression exercée par ses deux extrémités sur les deux bords de la bande.This mounting method is simpler. In addition, it above all makes the edge 21 free to rotate about this axis 50, as symbolized by the arrow 50A, by letting it orient itself, in response to a possible variation in tension that may present. between them the two longitudinal edges of the strip under its ends. This degree of freedom of orientation of the edge makes it possible to at least partially compensate for a different strip tension along the edge. The edge is oriented by itself and remains in a stable position with the same pressure exerted by its two ends on the two edges of the strip.

En outre, dans cette même variante de réalisation, le rouleau 2 de bande ne repose plus directement au fond d'un bac le retenant comme dans la figure 1 mais est monté entre deux organes presseurs 52, tels que deux cônes ou deux cylindres étagés, partiellement engagés dans son mandrin 2A. Ces deux cônes 52 sont sollicités l'un vers l'autre pour maintenir le rouleau 2 entre eux, tout en le laissant tourner.Furthermore, in this same variant embodiment, the roller 2 band no longer rests directly on the bottom of a tray retaining it as in Figure 1 but is mounted between two pressing members 52, such as two cones or two stepped cylinders, partially engaged in its mandrel 2A. These two cones 52 are biased towards each other to hold the roller 2 between them, while leaving it to rotate.

Dans cette variante les deux cônes sont sollicités l'un vers l'autre pour exercer un couple de freinage constant sur le mandrin 2A du rouleau 2. Ils sont portés par deux lames ressort 53 montées dans le châssis de machine 12, qui permettent une mise en place aisée du rouleau, par un simple écartement à la main de ces lames. Avantageusement une seule de ces lames ressort est élastique et l'autre est rigide.In this variant, the two cones are urged towards each other to exert a constant braking torque on the mandrel 2A of the roller 2. They are carried by two spring blades 53 mounted in the machine frame 12, which allow setting in easy place of the roller, by a simple spacing by hand of these blades. Advantageously, only one of these spring blades is elastic and the other is rigid.

En fonctionnement, le couple de freinage constant engendre une force de traction sur le brin de bande allant jusqu'à l'arête 21 de la lame 20′ qui est croissante, au fur et à mesure que le diamètre du rouleau diminue et donc que la courbure de la bande débitée du rouleau augmente. Cet accroissement de tension de bande sous l'arête 21 avec la diminution du diamètre de rouleau permet une compensation au moins partielle de la varition de courbure initiale de la bande avec le diamètre du rouleau, en accentuant la correction réalisée au fur et à mesure que la courbure initiale croît.In operation, the constant braking torque generates a tensile force on the strip strand up to the edge 21 of the blade 20 ′ which is increasing, as the diameter of the roller decreases and therefore that the curvature of the rolled strip increases. This increase in strip tension under the edge 21 with the decrease in the roll diameter allows at least partial compensation for the initial variation in curvature of the strip with the roll diameter, accentuating the correction carried out as the initial curvature increases.

Dans cette variante selon la figure 7, on a montré que le dispositif peut comporter en outre un détecteur 55 d'état de courbure des feuilles délivrées. Ce détecteur 55 est représenté en pointillés car utilisé de manière optionnelle, dans des réalisations préféren­tielles décrites ci-après, pour contrôler une correction de courbure résiduelle détectée.In this variant according to FIG. 7, it has been shown that the device can also comprise a detector 55 for the state of curvature of the sheets delivered. This detector 55 is shown in dotted lines because it is optionally used, in the preferred embodiments described below, to control a correction of detected residual curvature.

Le détecteur 55 est avantageusement constitué par une source photo-électrique d'émission/réception, à cellule émettrice 55A et cellule réceptrice 55B. Cette source est montée, au dessous et à faible distance de la trajectoire de bande, en aval du couteau 8A, 8B. Elle est légèrement encastrée dans la face supérieure d'un support 56 fixé, dans le châssis de machine, avec ses cellules 55A et 55B disposées selon le sens d'avance de la bande. En fonction­nement, la lumière émise par la cellule émettrice est partiellement réfléchie par la bande. La cellule réceptrice sensible au niveau de lumière réfléchie captée délivre en correspondance un signal traduisant une absence de courbure ou une éventuelle courbure rési­duelle et son sens. La faible distance entre la source et la trajec­toire de bande et un étalonnage du signal de mesure permettent de détecter le sens et l'amplitude de la courbure résiduelle, résultant d'un effet insuffisant ou excessif de la lame de cintrage. Un circuit électronique, non représenté, est bien entendu couplé à cette cellule réceptrice, il interprète son signal de sortie pour la commande correspondante de correction de courbure qu'il contrôle.The detector 55 is advantageously constituted by a photoelectric source of transmission / reception, with transmitting cell 55A and receiving cell 55B. This source is mounted, below and at a short distance from the strip path, downstream of the knife 8A, 8B. It is slightly recessed in the upper face of a support 56 fixed, in the machine chassis, with its cells 55A and 55B arranged in the direction of advance of the strip. In operation, the light emitted by the emitting cell is partially reflected by the strip. The receiving cell sensitive to the level of reflected light captured delivers in correspondence a signal translating an absence of curvature or a possible residual curvature and its direction. The short distance between the source and the strip path and a calibration of the measurement signal make it possible to detect the direction and the amplitude of the residual curvature, resulting from an insufficient or excessive effect of the bending blade. An electronic circuit, not shown, is of course coupled to this receiving cell, it interprets its output signal for the corresponding command of correction of curvature which it controls.

Les figure 8 et 9 correspondent à deux exemples préférentiels de mise en oeuvre du contrôle de correction de courbure assurée à partir dudit détecteur.FIGS. 8 and 9 correspond to two preferred examples of implementation of the control of correction of curvature ensured from said detector.

Dans la figure 8, on a simplement représenté un premier mode préférentiel de correction de courbure résiduelle de bande détectée par le détecteur 55, qui est assurée en agissant sur la tension de bande débitée du rouleau 2.In FIG. 8, a first preferential mode of correction of residual band curvature detected by the detector 55 has simply been shown, which is ensured by acting on the band tension delivered from the roller 2.

Le dispositif de traitement correspondant est en tout point conforme à celui de la figure 7, exception faite du montage à freinage contrôlé du rouleau 2, conduisant à une variation de la tension du brin situé entre le rouleau de papier 2 et le rouleau d'entraînement ou de traction 4, et donc de la tension du papier sous l'arête 21 de la lame 20′.The corresponding processing device conforms in all respects to that of FIG. 7, except for the assembly with controlled braking of the roller 2, leading to a variation in the tension of the strand located between the paper roller 2 and the drive roller or traction 4, and therefore of the tension of the paper under the edge 21 of the blade 20 ′.

Selon cette figure 8, le rouleau de papier 2 est toujours monté entre deux cônes presseurs ou analogues, partiellement engagés dans le mandrin 2A du rouleau, mais l'un des cônes noté 52A est fixe, tandis que l'autre noté 52B et dit cône mobile est commandé en translation.According to this figure 8, the paper roll 2 is always mounted between two pressing cones or the like, partially engaged in the mandrel 2A of the roller, but one of the cones denoted 52A is fixed, while the other denoted 52B and said cone mobile is controlled in translation.

Le cône fixe 52A est porté sur un support rigide 60. Une cale 61 peut lui être associée pour autoriser l'utilisation de plusieurs largeurs de bande en rouleau. Le cône mobile 52B est quant à lui couplé à un moteur pas à pas à commande asservie au signal délivré par le détecteur 55 précité (figure 7). Ce moteur pas à pas n'est pas en tant que tel représenté, seul son arbre moteur de commande est repéré en 62. Cet arbre moteur 62 est couplé à un bras de commande 63 par deux pignons dentés, ou analogues, 64, 65 en prise l'un sur l'autre et qui sont montés l'un sur l'arbre 62 et l'autre à l'une des extrémités du bras 63. Le bras 63 commande une bielle 66. Il présente à son autre extrémité un ergot 63A retenu engagé dans une lumière oblongue 66A à l'une des extrémités de la bielle. La bielle est elle même articulée sensiblement en son milieu sur un axe 66B et à son autre extrémité 66C sur une tige d'actionnement 67 portant le cône mobile 52B. La tige d'actionnement 67 est guidée en translation dans des paliers 68, ainsi que traduit par la flèche associée 67A. Ces paliers assurent une immobilisation en rotation du cône mobile 52B. Un organe de pression 69, tel qu'un système à ressort, est associé au cône 52B et évite un éventuel blocage en rotation du rouleau de papier, lors de sa mise en place entre les cônes 52A, 52B.The fixed cone 52A is carried on a rigid support 60. A wedge 61 can be associated with it to authorize the use of several widths of strip on a roll. The movable cone 52B is in turn coupled to a stepping motor with control controlled by the signal delivered by the aforementioned detector 55 (FIG. 7). This engine step by step is not as such shown, only its drive motor shaft is identified at 62. This drive shaft 62 is coupled to a control arm 63 by two toothed pinions, or the like, 64, 65 in engagement l 'one on the other and which are mounted one on the shaft 62 and the other at one of the ends of the arm 63. The arm 63 controls a connecting rod 66. It has at its other end a pin 63A retained engaged in an oblong slot 66A at one end of the connecting rod. The connecting rod is itself articulated substantially in its middle on an axis 66B and at its other end 66C on an actuating rod 67 carrying the movable cone 52B. The actuating rod 67 is guided in translation in bearings 68, as well as translated by the associated arrow 67A. These bearings provide immobilization in rotation of the movable cone 52B. A pressure member 69, such as a spring system, is associated with the cone 52B and prevents any possible blocking in rotation of the paper roll, when it is placed between the cones 52A, 52B.

Le moteur pas à pas est à commande programmée déclenchée par l'opérateur, à partir d'un bouton poussoir, pour la mise de ce cône mobile dans une position rétractée de chargement ou de déchargement de rouleau puis dans une position initiale de retenue du rouleau. Cette commande programmée est assurée par détection d'un nombre défini de pas du moteur depuis la position rétractée, auquel correspond un couple de freinage minimal défini exercé par les deux cônes sur le rouleau 2 après son chargement.The stepper motor is a programmed command triggered by the operator, from a push button, for putting this movable cone in a retracted position for loading or unloading the roller and then in an initial position for retaining the roller. . This programmed command is ensured by detection of a defined number of motor steps from the retracted position, to which corresponds a defined minimum braking torque exerted by the two cones on the roller 2 after its loading.

En cours de fonctionnement, la rotation du moteur pas à pas est commandée en nombre de pas et en sens, à partir du détecteur 55. Il s'ensuit une translation de la tige 67 et une pression accrue du cône 52B dans le mandrin, au fur et à mesure que le diamètre du rouleau diminue. Toute pression excessive est corrigée. Cette pression plus ou moins importante exercée sur le mandrin du rouleau permet l'obtention d'un freinage plus ou moins intense de sa rotation. Elle se traduit par une variation en correspondance de la tension du papier sous l'arête de la lame de cintrage et donc de l'effet de cette arête, pour l'obtention de feuilles détectées quasi-planes.During operation, the rotation of the stepping motor is controlled in number of steps and in direction, from the detector 55. This results in a translation of the rod 67 and increased pressure of the cone 52B in the mandrel, at as the diameter of the roller decreases. Any excessive pressure is corrected. This more or less significant pressure exerted on the mandrel of the roller makes it possible to obtain more or less intense braking of its rotation. It results in a corresponding variation in the tension of the paper under the edge of the bending blade and therefore in the effect of this edge, in order to obtain sheets that are detected to be almost plane.

Cette correction de la courbure résiduelle détectée sur la bande en aval du couteau, par variation contrôlée du couple de freinage exercé sur le rouleau, s'avère particulièrement efficace et est de mise en oeuvre simple. Elle permet aussi une mise en place très facile du rouleau de papier.This correction of the residual curvature detected on the strip downstream of the knife, by controlled variation of the braking torque exerted on the roller, proves to be particularly effective and is simple to implement. It also allows very easy positioning of the paper roll.

Dans la figure 9, on a représenté un deuxième mode'préférentiel de correction de courbure résiduelle de bande, détectée par le détecteur 55, qui est réalisée en agissant sur l'angle, noté a, que fait la bande issue du rouleau 2 avec la lame de cintrage 20′, contre son arête 21. Ce dispositif est en tout point conforme à celui représenté dans la figure 7, exception faite du montage de l'axe de guidage 30 rendu mobile verticalement pour contrôler cet angle a. En particulier dans ce dispositif, le couple de freinage exercé sur le rouleau 2 reste constant comme dans la réalisation selon la figure 7. Il engendre en conséquence une force grandissante sur le brin de papier, au fur et à mesure que le diamètre du rouleau diminue, qui favorise la correction de courbure initiale de bande sans toutefois l'optimiser.In FIG. 9, there is shown a second preferred mode of correction of residual band curvature, detected by the detector 55, which is produced by acting on the angle, noted a, made by the band coming from the roll 2 with the bending blade 20 ′, against its edge 21. This device conforms in all points to that shown in FIG. 7, except for the mounting of the guide pin 30 made vertically movable to control this angle a. In particular in this device, the braking torque exerted on the roller 2 remains constant as in the embodiment according to FIG. 7. It consequently generates an increasing force on the paper strand, as the diameter of the roller decreases , which favors the correction of the initial curvature of the strip without optimizing it.

La correction de la courbure résiduelle est réalisée par asservissement de la position de l'axe 30 et donc de l'angle a à cette courbure résiduelle détectée par le détecteur 55. L'axe 30 est monté entre deux supports identiques 70 écartés l'un de l'autre de la largeur maximale de bande. Ces supports 70 sont eux mêmes portés par des tiges d'actionnement 71, les tiges sont coulissantes dans des paliers 72 solidaires du châssis de machine 12. Ces tiges 72 sont commandées dans les paliers 72, à partir d'un moteur pas à pas lui même commandé à partir du détecteur 55. Ce moteur pas à pas n'est pas en tant que tel représenté, seul son arbre moteur de commande est repéré en 73. L'arbre moteur 73 est couplé à un arbre mené 74 par un deux pignons dentés 75, 76 ou analogues, en prise l'un sur l'autre et montés l'un sur l'arbre 73 et l'autre sur l'arbre 74. Cet arbre mené est un arbre à deux cames identiques 77 pour l'une et l'autre des deux tiges 72. Deux ressorts de rappel 78, montés sur la partie supérieure de chaque tige 72, entre l'axe 30 et le palier supérieur 72, assurent le maintien en contact des tiges 72 sur les cames 77.The correction of the residual curvature is carried out by slaving the position of the axis 30 and therefore of the angle a to this residual curvature detected by the detector 55. The axis 30 is mounted between two identical supports 70 one apart on the other of the maximum bandwidth. These supports 70 are themselves carried by actuating rods 71, the rods are sliding in bearings 72 integral with the machine frame 12. These rods 72 are controlled in the bearings 72, from a stepping motor itself. even controlled from detector 55. This stepping motor is not as such shown, only its drive motor shaft is identified at 73. The motor shaft 73 is coupled to a driven shaft 74 by a two pinions toothed 75, 76 or the like, engaged one on the other and mounted one on the shaft 73 and the other on the shaft 74. This driven shaft is a shaft with two identical cams 77 for the one and the other of the two rods 72. Two return springs 78, mounted on the upper part of each rod 72, between the axis 30 and the upper bearing 72, keep the rods 72 in contact with the cams 77.

En fonctionnement, au fur et à mesure que le diamètre du rouleau 2 diminue, la courbure initiale de la bande de papier augmente. Cette variation de courbure est compensée d'une part par la tension croissante du brin sous l'arête 21 de la lame de cintrage 20′, due au couple de freinage constant exercé par les cônes presseurs 52, et d'autre part par la variation contrôlée de l'angle a, due à l'asservissement en position de l'axe 30 réalisé à partir du détecteur 55 et du moteur pas à pas de commande. La courbure résiduelle détectée permet de commander le nombre de pas et le sens de rotation de ce moteur. Il s'ensuit une rotation en correspondance des cames 77 et une translation verticale de l'axe de guidage 30. L'angle a varie en conséquence et ajuste l'effet de planage de l'arête 21 sur la bande pour l'obtention d'une courbure résiduelle détectée quasi-nulle.In operation, as the diameter of the roll 2 decreases, the initial curvature of the paper strip increases. This variation in curvature is compensated on the one hand by the increasing tension of the strand under the edge 21 of the bending blade 20 ′, due to the constant braking torque exerted by the pressure cones 52, and on the other hand by the variation controlled angle a, due to the servo in position of the axis 30 made from the detector 55 and the control stepper motor. The residual curvature detected makes it possible to control the number of steps and the direction of rotation of this motor. It follows a corresponding rotation of the cams 77 and a vertical translation of the guide axis 30. The angle a varies accordingly and adjusts the leveling effect of the edge 21 on the strip to obtain d '' a residual curvature detected almost zero.

Dans ce montage, le moteur pas à pas est à commande programmée pour permettre une course maximale de l'axe 30 d'une position initiale dans laquelle il est représenté, à une position maximale possible, dans laquelle l'axe 30 est montré en pointillés, par une rotation sur un demi-tour de l'arbre 74 et donc des cames 77.In this assembly, the stepping motor is with programmed control to allow a maximum stroke of the axis 30 from an initial position in which it is represented, to a maximum possible position, in which the axis 30 is shown in dotted lines , by a rotation of the shaft 74 and therefore of the cams 77 on a half-turn.

Cette optimisation de la correction de courbure résiduelle est très efficace et de mise en oeuvre restant relativement simple, bien que légèrement plus complexe que celle réalisée selon la figure 8.This optimization of the residual curvature correction is very effective and is relatively simple to implement, although slightly more complex than that carried out according to FIG. 8.

Dans la figure 10, on a représenté une variante de réalisation du dispositif, avec compensation de la variation de courbure initiale de la bande réalisée par variation de tension de la bande sous l'arête 21 de la lame 20′ et par variation de l'angle a que fait la bande issue du rouleau 2 avec la lame 20′, contre son arête 21. Cette compensation est assurée dans ce cas sans asservissement des paramètres concernés à une détection de courbure résiduelle.In FIG. 10, an alternative embodiment of the device is shown, with compensation for the variation in initial curvature of the strip produced by variation of tension of the strip under the edge 21 of the blade 20 ′ and by variation of the angle a made by the strip coming from the roller 2 with the blade 20 ′, against its edge 21. This compensation is ensured in this case without subjecting the parameters concerned to a detection of residual curvature.

L'organisation d'ensemble des éléments du dispositif selon la figure 10 est analogue à celle du dispositif selon la figure 7, exeption faite du montage de l'axe de guidage 30 et du rouleau de papier 2 dans le châssis de machine 12. Le rouleau 2 reste maintenu par les deux organes presseurs précédents 52 tels que cônes montés sur les lames supports 53 dont l'une au moins est élastique. Il est soumis à un couple de freinage constant exercé par les cônes presseurs. La tension de bande sous l'arête est donc croissante au fur et à mesure que le diamètre du rouleau diminue.The overall organization of the elements of the device according to FIG. 10 is similar to that of the device according to FIG. 7, except for the mounting of the guide pin 30 and the paper roll 2 in the machine chassis 12. The roller 2 remains held by the two preceding pressing members 52 such as cones mounted on the support blades 53, at least one of which is elastic. he is subjected to a constant braking torque exerted by the pressure cones. The belt tension under the edge therefore increases as the diameter of the roll decreases.

En outre, les lames support 53 et des supports 30A pour l'axe de guidage 30 sont portés par une plate-forme 80. La plate-forme 80 est articulée autour d'un axe 81 solidaire du châssis de machine 12, cet axe d'articulation 81 étant plus à l'intérieur que le rouleau 2 et l'axe de guidage 30, dans le châssis 12. Elle est par ailleurs supportée élastiquement par un ressort 82 monté sous elle, en regard du rouleau 2 sensiblement, qui la sollicite à l'encontre du poids du rouleau pour son pivotement autour de l'axe d'articulation 81, selon la flèche 80A.In addition, the support blades 53 and supports 30A for the guide axis 30 are carried by a platform 80. The platform 80 is articulated around an axis 81 secured to the machine frame 12, this axis d hinge 81 being more inside than the roller 2 and the guide pin 30, in the chassis 12. It is also resiliently supported by a spring 82 mounted under it, facing the roller 2 substantially, which urges it against the weight of the roller for its pivoting around the articulation axis 81, according to arrow 80A.

En fonctionnement, la poussée du ressort 82 est d'autant plus efficace que le poids du rouleau diminue. Il s'ensuit en consé­quence un pivotement de la plate-forme 80, d'une position initiale sensiblement horizontale, quand le rouleau 2 est plein, à une position finale en biais, qui est définie par les limites d'action du ressort et est illustrée en pointillés, quand le rouleau 2 est pratiquement vide. A cette position initiale correspondent des positions initiales du rouleau sur les cônes presseurs 52 et de l'axe de guidage 30, pour lesquelles la bande issue du rouleau fait un angle initial a défini avec la lame 20′, contre son arête 21. A la position finale de la plate-forme 80 correspondent également des positions finales du rouleau pratiquement vide et de l'axe de guidage, dans lesquelles ils sont montrés en pointillés, qui conduisent à une diminution de la valeur de l'angle a que fait la bande, alors illustrée en pointillés, avec la lame 20′. Cette variation de l'angle a et la variation de tension de bande sous l'arête 21, au fur et à mesure que le diamètre du rouleau diminue, compensent au moins partiellement la courbure initiale allant en croissant que présente la bande. Bien entendu le ressort 82 est un ressort taré dont la déformation en fonction du poids est définie en regard du couple de freinage pour l'obtention d'une variation souhaitée de l'angle a.In operation, the thrust of the spring 82 is all the more effective as the weight of the roller decreases. It follows consequently a pivoting of the platform 80, from a substantially horizontal initial position, when the roller 2 is full, to a final biased position, which is defined by the limits of action of the spring and is illustrated in dotted lines, when the roller 2 is practically empty. To this initial position correspond initial positions of the roller on the pressure cones 52 and of the guide axis 30, for which the strip coming from the roller makes an initial angle defined with the blade 20 ′, against its edge 21. At the final position of the platform 80 also correspond to the final positions of the practically empty roller and of the guide axis, in which they are shown in dotted lines, which lead to a reduction in the value of the angle a made by the strip , then illustrated in dotted lines, with the blade 20 ′. This variation of the angle a and the variation of strip tension under the edge 21, as the diameter of the roll decreases, at least partially compensate for the initial increasing curvature which the strip has. Of course the spring 82 is a calibrated spring whose deformation as a function of the weight is defined with respect to the braking torque in order to obtain a desired variation of the angle a.

En regard des figures 7 à 10, la lame de cintrage a été consi­dérée montée libre en rotation sur son axe support pour que son arête s'oriente d'elle-même contre la bande de papier. Bien que ce mode de montage soit celui préférentiel, le dispositif de traitement avec compensation des variations de courbure initiale de bande ou asservissement à une courbure résiduelle détectée peut être équipé d'une lame de cintrage montée comme dans le dispositif de la figure 1. En outre, la lame de cintrage peut également être libre en rotation sur un support indépendant du châssis de tête d'impression et ce support indépendant peut être rendu mobile, par un mécanisme de commande analogue à celui représenté dans la figure 9 pour l'axe de guidage, l'axe de guidage étant rendue fixe quand la lame est rendue mobile.With reference to FIGS. 7 to 10, the bending blade has been considered to be mounted to rotate freely on its support axis so that its edge turns itself against the strip of paper. Although this mounting method is the preferred one, the processing device with compensation for variations in the initial curvature of the strip or slaving to a detected residual curvature can be fitted with a bending blade mounted as in the device in FIG. 1. in addition, the bending blade can also be free to rotate on a support independent of the print head chassis and this independent support can be made mobile, by a control mechanism similar to that shown in FIG. 9 for the axis of guide, the guide pin being made fixed when the blade is made mobile.

Claims (14)

1/ Ensemble de planage de documents délivrés sous forme de feuilles découpées successivement sur une bande continue en rouleau, duquel elle est débitée par des moyens d'entraînement (4), comportant entre ledit rouleau (2) et lesdits moyens d'entraînement (4), une lame de cintrage (20, 20′) présentant une arête terminale (21) en appui contre la face extérieure de la bande (1) issue de rouleau (2), et des moyens de guidage (30) de la bande en amont de ladite lame de cintrage, caractérisé en ce que ladite arête (21) de la lame de cintrage (20) est sensiblement semi-circulaire et lisse avec un rayon de courbure inférieur à 2 mm.1 / assembly for leveling documents delivered in the form of sheets cut successively on a continuous strip in a roll, from which it is cut by drive means (4), comprising between said roller (2) and said drive means (4 ), a bending blade (20, 20 ′) having an end edge (21) bearing against the outer face of the strip (1) coming from the roller (2), and means for guiding (30) the strip in upstream of said bending blade, characterized in that said edge (21) of the bending blade (20) is substantially semi-circular and smooth with a radius of curvature less than 2 mm. 2/ Ensemble de planage selon la revendication 1, caractérisé en ce que le rayon de courbure de l'arête (21) est compris entre 0,2 et 0,6 mm et a pour valeur préférentielle 0,3 à 0,5 mm.2 / leveling assembly according to claim 1, characterized in that the radius of curvature of the edge (21) is between 0.2 and 0.6 mm and has the preferred value 0.3 to 0.5 mm. 3/ Ensemble de planage selon l'une des revendications 1 et 2, caracté­risé en ce que ladite lame de cintrage (20′) est montée libre en rotation sensiblement transversalement à la bande (1), sur un axe support (50).3 / leveling assembly according to one of claims 1 and 2, characterized in that said bending blade (20 ′) is mounted free in rotation substantially transversely to the strip (1), on a support axis (50). 4/ Ensemble de planage selon l'une des revendication 1 et 3, caracté­risé en ce que l'arête (21) de ladite lame de cintrage (20) présente, selon sa longueur, un profil convexe (21A) appliqué contre la bande (1) selon sa largeur.4 / leveling assembly according to one of claims 1 and 3, characterized in that the edge (21) of said bending blade (20) has, along its length, a convex profile (21A) applied against the strip ( 1) according to its width. 5/ Ensemble de planage selon l'une des revendications 1 à 4, caracté­risé en ce que lesdits moyens de guidage (30) sont constitués par un élément unique, semi-circulaire, dit axe de guidage (30) recevant contre lui la face intérieure de la bande.5 / leveling assembly according to one of claims 1 to 4, characterized in that said guide means (30) are constituted by a single element, semi-circular, said guide axis (30) receiving against it the inner face Of the band. 6/ Ensemble de planage selon la revendication 5, caractérisé en ce que ladite lame de cintrage (20) est montée sur un premier support (11) et ledit axe de guidage sur un deuxième support (12), et que l'un des éléments définis par ladite lame et ledit axe est monté mobile en regard de la bande qu'il reçoit contre lui.6 / planing assembly according to claim 5, characterized in that said bending blade (20) is mounted on a first support (11) and said guide pin on a second support (12), and that one of the elements defined by said blade and said axis is mounted movable opposite the strip it receives against it. 7/ Ensemble de planage selon la revendication 6, caractérisé en ce qu'il comporte un moteur (40) de commande de positionnement de l'un des éléments définis par ladite lame de cintrage (20) et ledit axe de guidage (30), en regard de la bande (1), et en ce que ledit moteur (40) est lui-même asservi à une détection de vitesse desdits moyens d'entraînement (4), pour éviter un marquage de la bande (1) par ladite lame de cintrage (20) en l'absence de commande desdits moyens d'entraînement (4).7 / a leveling assembly according to claim 6, characterized in that it comprises a motor (40) for controlling the positioning of one of the elements defined by said bending blade (20) and said guide axis (30), opposite the strip (1), and in this that said motor (40) is itself slaved to a speed detection of said drive means (4), to avoid marking of the strip (1) by said bending blade (20) in the absence of control of said drive means (4). 8/ Ensemble de planage selon l'une des revendications 5 et 6, caracté­risé en ce que ledit rouleau (2) est monté retenu entre deux organes presseurs (52, 52A, 52B) partiellement engagés dans son mandrin (2A), lesdits organes presseurs exerçant sur le rouleau un couple de freinage pour l'obtention d'une tension de bande, sous l'arête de ladite lame, qui croît au fur et à mesure que le diamètre du rouleau décroît.8 / leveling assembly according to one of claims 5 and 6, characterized in that said roller (2) is mounted retained between two pressing members (52, 52A, 52B) partially engaged in its mandrel (2A), said pressing members exerting on the roller a braking torque to obtain a belt tension, under the edge of said blade, which increases as the diameter of the roller decreases. 9/ Ensemble de planage selon la revendication 8, caractérisé en ce que lesdits organes presseurs (52) sont montés sollicités élasti­quement l'un vers l'autre, en exerçant un couple de freinage constant sur ledit rouleau.9 / planing assembly according to claim 8, characterized in that said pressing members (52) are mounted resiliently biased towards each other, by exerting a constant braking torque on said roller. 10/ Ensemble de planage selon la revendication 8, caractérisé en ce que l'un desdits organes presseurs (52A) est fixe et que l'autre (52B) est mobile en translation en regard de l'organe presseur fixe et couplé à un mécanisme d'actionnement en translation (62-­68) entraîné par un moteur pas à pas à commande asservie à un signal de détection de courbure résiduelle délivrée par un détecteur (55), ledit détecteur (55) étant monté en aval de ladite lame de cintrage et des moyens d'entraînement, sous la trajectoire de bande.10 / planing assembly according to claim 8, characterized in that one of said pressing members (52A) is fixed and that the other (52B) is movable in translation opposite the fixed pressing member and coupled to a mechanism in actuation in translation (62-68) driven by a stepping motor with control controlled by a residual curvature detection signal delivered by a detector (55), said detector (55) being mounted downstream of said bending blade and drive means, under the strip path. 11/ Ensemble de planage selon la revendication 8, et dans lequel ledit axe de guidage (30) est mobile en regard de ladite bande, caractérisé en ce que ledit axe de guidage (30) est couplé à des moyens d'actionnement (71, 73 - 77) entraînés par un moteur pas à pas à commande asservie à un signal de détection de courbure résiduelle délivrée par un détecteur (55), ledit détecteur étant monté en aval de ladite lame de cintrage (20, 20′) et lesdits moyens d'entraînement (4), sous la trajectoire de bande.11 / planing assembly according to claim 8, and wherein said guide axis (30) is movable opposite said strip, characterized in that said guide axis (30) is coupled to actuating means (71, 73 - 77) driven by a stepping motor with control controlled by a residual curvature detection signal delivered by a detector (55), said detector being mounted downstream of said bending blade (20, 20 ′) and said means drive (4), under the belt path. 12/ Ensemble de planage selon la revendication 11, caractérisé en ce que ledit axe de guidage (30) est monté sur des supports coulissants (70, 71) actionnés par des cames (77) portées par un arbre mené (74) couplé à l'arbre (73) dudit moteur pas à pas de commande.12 / leveling assembly according to claim 11, characterized in that said guide pin (30) is mounted on sliding supports (70, 71) actuated by cams (77) carried by a driven shaft (74) coupled to the 'shaft (73) of said stepper motor ordered. 13/ Ensemble de planage selon l'une des revendications 10 à 12, caractérisé en ce que ledit détecteur (55) est constitué par une source photo-électrique montée encastrée dans un support (56) et comportant une cellule émettrice (55A) et une cellule réceptrice (55B) disposées sensiblement côte à côte, selon le sens d'avance de la bande au dessus d'elles, et couplées l'une à l'autre par réflexion de lumière issue de la cellule émettrice par la bande elle-même.13 / leveling assembly according to one of claims 10 to 12, characterized in that said detector (55) consists of a photoelectric source mounted embedded in a support (56) and comprising an emitting cell (55A) and a receiving cell (55B) arranged substantially side by side, in the direction of advance of the strip above them, and coupled to each other by reflection of light from the transmitting cell by the strip itself . 14/ Ensemble de planage selon la revendication 9 et dans lequel ledit axe de guidage (30) est mobile en regard de ladite bande, caractérisé en ce que ledit axe de guidage (30) et ledit rouleau (2) sont montés sur des supports individuels (30A, 53) portés par une même plate-forme (80) et en ce que ladite plate-forme (80) est elle-même d'une part articulée sur un axe fixe (81), situé au dessous et en aval dudit axe de guidage, et d'autre part supportée élastiquement par un ressort (82) la sollicitant à l'encontre du poids du rouleau (2).14 / leveling assembly according to claim 9 and wherein said guide pin (30) is movable opposite said strip, characterized in that said guide pin (30) and said roller (2) are mounted on individual supports (30A, 53) carried by the same platform (80) and in that said platform (80) is itself on the one hand articulated on a fixed axis (81), located below and downstream of said guide pin, and secondly resiliently supported by a spring (82) urging it against the weight of the roller (2).
EP89123451A 1988-12-23 1989-12-19 Document-smoothing assembly Withdrawn EP0374827A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8817102A FR2641767A1 (en) 1988-12-23 1988-12-23 ASSEMBLY FOR PLANTING DOCUMENTS
FR8817102 1988-12-23

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EP0374827A1 true EP0374827A1 (en) 1990-06-27

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FR (1) FR2641767A1 (en)

Cited By (7)

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EP0410458A2 (en) * 1989-07-27 1991-01-30 Canon Kabushiki Kaisha Curl correcting device
EP0876978A2 (en) * 1997-03-28 1998-11-11 BIELOMATIK LEUZE GmbH + Co. Device to curl ply-material, especially paper
EP0785158A3 (en) * 1996-01-17 1998-12-16 Fuji Photo Film Co., Ltd. Method of and apparatus for measuring curl of web, method of and apparatus for correcting curl of web, and apparatus for cutting web
EP1950050A3 (en) * 2007-01-24 2009-04-22 Seiko Instruments Inc. Continuous sheet processing apparatus and continuous sheet processing method
CN101850915A (en) * 2010-06-21 2010-10-06 苏州康尼包装材料有限公司 Rolling and unrolling device for film blowing machine
DE102009022248A1 (en) 2009-05-20 2010-12-09 E.C.H. Will Gmbh Material web i.e. paper web, decambering device for paper or book blocks manufacturing device, has milling tool supported such that immersion depth of contact section into path is adjustable independently at its two sides
CN105774219A (en) * 2016-03-10 2016-07-20 孟红琳 Wave energy type soft material surface leveling device

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Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0410458A3 (en) * 1989-07-27 1992-04-22 Canon Kabushiki Kaisha Curl correcting device
US5637070A (en) * 1989-07-27 1997-06-10 Canon Kabushiki Kaisha Curl correcting device
EP0410458A2 (en) * 1989-07-27 1991-01-30 Canon Kabushiki Kaisha Curl correcting device
US5975745A (en) * 1996-01-17 1999-11-02 Fuji Photo Film Co., Ltd. Method of and apparatus for measuring curl of web, method of and apparatus for correcting curl of web, and apparatus for cutting web
EP0785158A3 (en) * 1996-01-17 1998-12-16 Fuji Photo Film Co., Ltd. Method of and apparatus for measuring curl of web, method of and apparatus for correcting curl of web, and apparatus for cutting web
EP0876978A2 (en) * 1997-03-28 1998-11-11 BIELOMATIK LEUZE GmbH + Co. Device to curl ply-material, especially paper
EP0876978A3 (en) * 1997-03-28 1999-08-18 BIELOMATIK LEUZE GmbH + Co. Device to curl ply-material, especially paper
US6302678B1 (en) 1997-03-28 2001-10-16 Bielomatik Leuze Gmbh & Co. Setting device for bending layer material more particularly paper
EP1950050A3 (en) * 2007-01-24 2009-04-22 Seiko Instruments Inc. Continuous sheet processing apparatus and continuous sheet processing method
DE102009022248A1 (en) 2009-05-20 2010-12-09 E.C.H. Will Gmbh Material web i.e. paper web, decambering device for paper or book blocks manufacturing device, has milling tool supported such that immersion depth of contact section into path is adjustable independently at its two sides
DE102009022248B4 (en) 2009-05-20 2019-04-25 Bw Papersystems Hamburg Gmbh Entwölbungsvorrichtung for Entwölbung a web, especially in a plant of the paper processing industry
CN101850915A (en) * 2010-06-21 2010-10-06 苏州康尼包装材料有限公司 Rolling and unrolling device for film blowing machine
CN105774219A (en) * 2016-03-10 2016-07-20 孟红琳 Wave energy type soft material surface leveling device

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